Originally Posted by Animal-Chin
Got home today and the few I saw yesterday were a hundred today. Did an emergency water change and sucked them out. Are the orange flatworms bad for coral?
According to my lfs
, they irritate corals such as torches, hammers, Duncans, etc. They get on them and eat the secretion that they produce making them recede but rarely killing them. If you use Flatworm Exit, follow the directions and make sure you siphon out as many as possible. Apparently when they die en masse they can release a toxin that can kill corals. But don't get nervous (like I did when I treated) if you miss a few that won't hurt anything. The Flatworm Exit will not hurt fish or corals.